This long Jubilee weekend is supposed to be a time of celebration for the Royal Family, but there's sadness this evening with news that Prince Philip, the Queen's husband, has been hospitalised.
The Duke of Edinburgh will miss the remainder of the royal engagements to mark the occasion due to a bladder infection.
He was taken in to the King Edward VII hospital as a "precautionary measure", according to an offical statement, and will remain there for a few days.
It means he will not be joining his family for the concert organised by Gary Barlow later this evening. He will also miss the national service of thanksgiving at St Paul's Cathedral tomorrow and the carriage procession from Westminster Hall to Buckingham Palace.
The Palace said: "He is understandably disappointed at missing tonight's Jubilee Concert and tomorrow's engagements."
It is pointed out, however, that his condition is probably not linked to yesterday's Thames River Pageant, where the 90-year-old was on his feet for four hours in cold and wet weather.
It's not the first time recently that Philip has had to miss a major occasion due to illness - he spent Christmas in hospital last year as he recovered from a "minimally invasive" procedure.
Royal regulars such as Prince William, Kate Middleton, Prince Harry, Prince Charles and Camilla have been out in force this weekend to mark our monarch's sixtieth year on the throne.
Kate marks the occasion in red